uv Photoemission for Rare Gases Implanted in Ge

The first ultraviolet photoemission spectra of the valence electrons of rare-gas atoms, implanted by ion bombardment into an amorphous Ge matrix, are presented here. The positions of the peaks in the observed spectra are shifted relative to gas-phase spectra, consistent with a final-state screening-energy shift which varies inversely with the radius of the particular implant, as predicted by a linear-response relaxation model described herein.